Well yes it does. RMS power stands for Rate Mean Square. Which is a measure of constant output power over a 1 minute interval. Peak power is a rating of power of a 1 millisecond burst of signal and it is the highest power that the amp can put out without square waving in 1 millisecond. Peak power is more useful of a measurement for high volume musical peaks and RMS is a more real world measurement meant to be what to expect from the amp in normal circumstances with normal volume loads. Dynamic power output and peak power output are used by different companies but mean the same thing in almost all cases. The only other measurement that most companies publish without going through the owners manual or pdf is the Dynamic Headroom which basically the difference between the RMS power and the Peak power output of an amplifier. It is kind or hard to believe that the 55 watt amp in this sub has a peak power of 225 watts, but is not unheard of I suppose. that just means that the amp is a more dynamic peak oriented amplifier than a continuous power output amp which for a sub meant for movie peaks it would not seem as different for a company to do such a thing.